Question

The speed at which the flow of water in a long cylindrical pipe of diameter 6 cm becomes turbulent is ______

(The viscosity of water = 1 x 10^-3 Pa.s and for the onset of turbulent flow in a long cylindrical pipe, Reynolds number = 3000) 

Options

• 0.6 m/s

• 0.05 m/s

• 0.3 m/s

• 0.15 m/s

Answer 1

The speed at which the flow of water in a long cylindrical pipe of diameter 6 cm becomes turbulent is 0.05 m/s.

Explanation:

v_c = `("R"_"n"η)/(rho"D") = (3000 xx 10^-3)/(10^3 xx 0.06)` = 0.05 m/s